Genesis 26:16-21

Finally, Abimelech ordered Isaac to leave the country. “Go somewhere else,” he said, “for you have become too powerful for us.” So Isaac moved away to the Gerar Valley, where he set up their tents and settled down. He reopened the wells his father had dug, which the Philistines had filled in after Abraham’s death. Isaac also restored the names Abraham had given them. Isaac’s servants also dug in the Gerar Valley and discovered a well of fresh water. But then the shepherds from Gerar came and claimed the spring. “This is our water,” they said, and they argued over it with Isaac’s herdsmen. So Isaac named the well Esek (which means “argument”). Isaac’s men then dug another well, but again there was a dispute over it. So Isaac named it Sitnah (which means “hostility”).